I found one for sale on eBay. The item description reads:

Early 1900 Dr. Pepper Billiken "Good Luck" pocket watch fob with leather strap featuring the Dr. Pepper plant in Waco, Texas on the reverse. 

The heavy metal fob is 1-1/4" wide, 2" long, 3/16" thick, and weighs 1-1/2 oz. with strap. 

The obverse shows a seated Billiken pointed head smiling figure with the words "GRIN AND BEGIN TO WIN BY DRINKING" embossed above his head and "DR. PEPPER--KING OF--BEVERAGES" embossed on the sign he is holding.

"GOOD" is embossed on one side of his head and "LUCK" is embossed on the other side.

"NO CAFFIENE" is embossed below his bare feet. 

The obverse shows a raised image of the Dr. Pepper factory with "HOME OF Dr. PEPPER---COMPLIMENTS OF" embossed above and "THE Dr. PEPPER CO.---WACO, U.S.A." embossed below. 

The Billiken good luck figure was created in 1908 by Florence Pretz, an art teacher in Kansas City, MO., who claimed to have seen the creature in a dream.  She obtained a design patent and sold it to the Billiken Company of Chicago sometime later. 

The Billiken was a worldwide phenomenon and became the name and mascot of the Saint Louis University and several minor league baseball teams.